Power and thrust measurements of marine current turbines under various hydrodynamic flow conditions in a cavitation tunnel and a towing tank

2007 ◽  
Vol 32 (3) ◽  
pp. 407-426 ◽  
Author(s):  
A.S. Bahaj ◽  
A.F. Molland ◽  
J.R. Chaplin ◽  
W.M.J. Batten
Keyword(s):  
Hydrodynamic Flow ◽  
Flow Conditions ◽  
Towing Tank ◽  
Cavitation Tunnel ◽  
Marine Current

Numerical Predictions and Experimental Verifications for the Hydrodynamic Performance of Horizontal Axis Marine Current Turbine

2013 ◽  
Vol 694-697 ◽  
pp. 635-638
Author(s):  
Rui Jun Fan ◽  
Hong Chao Gao ◽  
J. R. Chaplin
Keyword(s):  
Hydrodynamic Performance ◽  
Experimental Measurements ◽  
Hydrodynamic Conditions ◽  
Towing Tank ◽  
Numerical Predictions ◽  
Turbine Performance ◽  
Marine Current Turbine ◽  
Cavitation Tunnel ◽  
Marine Current ◽  
Current Turbine

This paper presents the numerical predictions of 3D CFD rotor computations of an 800mm diameter model of marine current turbine (MCT). In the paper CFD is applied to a rotor at stationary hydrodynamic conditions Simulations from the numerical prediction are compared with experimental measurements of the model of MCT which is experimented on in a cavitation tunnel and a towing tank. The experimental data includes measurements of power and thrust generated by the turbine, in both a cavitation tunnel and a towing tank, for a series of blade pitch settings and speeds. The numerical predictions show similar results and provide a satisfactory representation of the experimental turbine performance.

Hydrodynamic flow conditions through permeable walls

1992 ◽  
Vol 2 (8) ◽  
pp. 1565-1569
Author(s):  
S. Vollmar ◽  
J. A. M. S. Duarte
Keyword(s):  
Hydrodynamic Flow ◽  
Flow Conditions ◽  
Permeable Walls

Cell Adhesion Under Hydrodynamic Flow Conditions

1995 ◽  
Vol 15 (1) ◽  
Author(s):  
Priya K. Gopalan ◽  
David A. Jones ◽  
Larry V. McIntire ◽  
C. Wayne Smith
Keyword(s):  
Cell Adhesion ◽  
Hydrodynamic Flow ◽  
Flow Conditions

The Evaluation of the Cavitational Damage in MgAl2Si Alloy Using Various Laboratory Stands

2016 ◽  
Vol 252 ◽  
pp. 61-70
Author(s):  
Robert Jasionowski ◽  
Dariusz Zasada ◽  
Wojciech Polkowski
Keyword(s):  
Cavitation Erosion ◽  
Erosion Resistance ◽  
Flow Conditions ◽  
Final Phase ◽  
Testing Conditions ◽  
Jet Impact ◽  
Cavitation Tunnel ◽  
Actual Flow ◽  
Cavitation Erosion Resistance ◽  
The Impact

Evaluation of cavitation erosion resistance of is carried out by using various testing stands, that differ by the way of cavitation excitation and its intensity. These various testing conditions have led to a standardization of some part of laboratory stands, that in turn allows a direct comparison of results obtained in different laboratories. The aim of this study was to determine the course of cavitational destruction of MgAl2Si alloy samples tested on three different laboratory stands. The research was conducted on a vibration stand according to ASTM G32, where cavitation is forced by the vibrating element; in the cavitation tunnel reflecting actual flow conditions, and on a jet impact stand- simulating the impact microjet in the final phase of the cavitational bubbles implosion. Each laboratory stand has given a different course of cavitational destruction.

scholarly journals Manoeuvring forces on azimuthing podded propulsor model

2007 ◽  
Vol 14 (2) ◽  
pp. 3-8 ◽  
Author(s):  
Maciej Reichel
Keyword(s):  
Deflection Angle ◽  
Open Water ◽  
Ship Design ◽  
Experimental Results ◽  
Research Centre ◽  
Test Program ◽  
Towing Tank ◽  
Carrier Model ◽  
Podded Propulsor ◽  
Cavitation Tunnel

Manoeuvring forces on azimuthing podded propulsor model This paper presents the preliminary part of comprehensive manoeuvring open-water tests of a gas carrier model. The paper focuses on open water experiments with an azimuthing podded propulsor. The test program was carried out in the cavitation tunnel and the large towing tank of Ship Hydromechanics Division, Ship Design and Research Centre, Gdańsk. The pod was tested as a pushing unit with a 161.3 mm diameter propeller. Steering forces were measured in the range of advance coefficient from 0.0 to 0.8 combined with the range of deflection angles from -45° up to +45°. Measurements on the pod without propeller were also performed. The experiment results are presented in the form of non-dimensional coefficients in function of advance coefficient and deflection angle. Analysis of the experimental results and the conclusions are presented.

An experimental investigation of microplastic transport in fluvial systems

2020 ◽  
Author(s):  
Jan-Pascal Boos ◽  
Benjamin-Silas Gilfedder ◽  
Hassan Elagami ◽  
Sven Frei
Keyword(s):  
Porous Media ◽  
Channel Flow ◽  
Open Channel ◽  
Treatment Plant ◽  
Open Channel Flow ◽  
Agricultural Runoff ◽  
Hydrodynamic Flow ◽  
Waste Water Treatment Plant ◽  
Flow Conditions ◽  
Fluvial Systems

<p>Although a major part of marine microplastic (MP) pollution originates from rivers and streams, the mechanistic behavior of MP in fluvial systems is only poorly understood. MP enter fluvial systems from e.g. waste water treatment plant (WWTP) effluents, sewer overflows during heavy rain events, agricultural runoff, aerial input/atmospheric fallout, road runoff or via fragmentation of plastic litter. As part of this project we want to investigate the hydrodynamic transport mechanisms that control the behavior and re-distribution of MP in open channel flow and the streambed sediments. Hydrodynamic conditions in open channel flow are represented in an experimental flume environment.  Different porous media materials (e.g. aqua beads, glass beads and sand) are used in the flume experiments to shape typical bed form structures such as riffle-pool sequences, ripples and dunes. The aim of this experimental setup is to create hydrodynamic flow conditions such as hydraulic jumps, low and high flow velocity environments for which the transport and sedimentation behavior of MP can be investigated under realistic conditions. Hydrodynamic flow conditions in the flume are characterized using a Laser-Doppler-Anemometry (LDA) and Particle Image Velocimetry (PIV). Detection and tracking of fluorescent MP-particles in open channel flow and in porous media will be achieved with a fluorescence-camera-system.</p>

scholarly journals An experimental and numerical study of the vortices generated by hydrofoils

2009 ◽  
Vol 16 (3) ◽  
pp. 11-17 ◽  
Author(s):  
J. Szantyr ◽  
R. Biernacki ◽  
P. Flaszyński ◽  
P. Dymarski ◽  
M. Kraskowski
Keyword(s):  
Velocity Field ◽  
Cross Sections ◽  
Numerical Study ◽  
Turbulence Models ◽  
Marine Propeller ◽  
Flow Conditions ◽  
Tip Vortices ◽  
Cavitation Tunnel ◽  
Computer Codes ◽  
Propeller Blades

An experimental and numerical study of the vortices generated by hydrofoils The article presents the results of the research project concerning the process of formation of the tip vortices shed from hydrofoils of different geometry in different flow conditions. Three hydrofoils resembling the contemporary marine propeller blades have been selected for the study. The experimental part of the project consisted of the LDA measurements of the velocity field in three cross-sections of the vortex generated by the hydrofoils in the cavitation tunnel. The numerical part of the project consisted of calculations of the corresponding velocity field by means of three computer codes and several selected turbulence models. The comparative analysis of the experimental and numerical results, leading to the assessment of the accuracy of the numerical methods, is included.

scholarly journals EFD and CFD Design and Analysis of a Propeller in Decelerating Duct

2012 ◽  
Vol 2012 ◽  
pp. 1-15 ◽  
Author(s):  
Stefano Gaggero ◽  
Cesare M. Rizzo ◽  
Giorgio Tani ◽  
Michele Viviani
Keyword(s):  
Experimental Information ◽  
Optimization Techniques ◽  
Towing Tank ◽  
Radiated Noise ◽  
Successive Refinement ◽  
Numerical Predictions ◽  
Complex Evaluation ◽  
Cavitation Tunnel ◽  
Lifting Line ◽  
Numerical Approaches

Ducted propellers, in decelerating duct configuration, may represent a possible solution for the designer to reduce cavitation and its side effects, that is, induced pressures and radiated noise; however, their design still presents challenges, due to the complex evaluation of the decelerating duct effects and to the limited amount of available experimental information. In the present paper, a hybrid design approach, adopting a coupled lifting line/panel method solver and a successive refinement with panel solver and optimization techniques, is presented. In order to validate this procedure and provide information about these propulsors, experimental results at towing tank and cavitation tunnel are compared with numerical predictions. Moreover, additional results obtained by means of a commercial RANS solver, not directly adopted in the design loop, are also presented, allowing to stress the relative merits and shortcomings of the different numerical approaches.

scholarly journals Systematic cavitation tunnel tests of a Propeller in uniform and inclined flow conditions as part of a round robin test campaign

2016 ◽  
Vol 120 ◽  
pp. 136-151 ◽  
Author(s):  
Batuhan Aktas ◽  
Mehmet Atlar ◽  
Serkan Turkmen ◽  
Emin Korkut ◽  
Patrick Fitzsimmons
Keyword(s):  
Round Robin ◽  
Flow Conditions ◽  
Round Robin Test ◽  
Cavitation Tunnel ◽  
Inclined Flow
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